Distribution angle control of a light-emitting diode downlight lens with high color uniformity using a scattering polymer

Keiichi Mochizuki, Kazumasa Oosumi, Fumiaki Koizumi, Yoshinori Shinohara, Akihiro Tagaya, Yasuhiro Koike

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

We have proposed a light-emitting diode (LED) downlight lens that is made of a highly scattered optical transmission (HSOT) polymer. The HSOT polymer contains optimized heterogeneous structures that produce homogeneously scattered light with forward directivity. The full width at half maximum of the illuminance distribution angle can be increased from 16.7° to 37.9° as the concentration of the scattering particles in the HSOT polymer LED downlight lenses of identical shape is increased from 0.015 to 0.100 wt%. The colors in an illuminated area are highly uniform, which is not discernible by the human eye, with a high output efficiency greater than 85 %.

Original languageEnglish
Pages (from-to)422-426
Number of pages5
JournalOptical Review
Volume22
Issue number3
DOIs
Publication statusPublished - 2015 Jun 29

Keywords

  • Color uniformity
  • Downlight lens
  • Highly scattered optical transmission polymer
  • Illuminance distribution
  • LED
  • LED lighting
  • Mie scattering theory

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

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